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package filter;

import Utils.User;
import java.io.IOException;
import java.io.PrintStream;
import java.io.PrintWriter;
import java.io.StringWriter;
import javax.servlet.Filter;
import javax.servlet.FilterChain;
import javax.servlet.FilterConfig;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;

/**
 *
 * @author Alice
 */
public class PDFilter implements Filter {
    
    private static final boolean debug = true;
    // The filter configuration object we are associated with.  If
    // this value is null, this filter instance is not currently
    // configured. 
    private FilterConfig config = null;
    
    public PDFilter() {
    }    
    
    private void doBeforeProcessing(ServletRequest request, ServletResponse response)
            throws IOException, ServletException {
        if (debug) {
           // log("PDFilter:DoBeforeProcessing");
        }

        // Write code here to process the request and/or response before
        // the rest of the filter chain is invoked.

        // For example, a logging filter might log items on the request object,
        // such as the parameters.
	/*
         * for (Enumeration en = request.getParameterNames();
         * en.hasMoreElements(); ) { String name = (String)en.nextElement();
         * String values[] = request.getParameterValues(name); int n =
         * values.length; StringBuffer buf = new StringBuffer();
         * buf.append(name); buf.append("="); for(int i=0; i < n; i++) {
         * buf.append(values[i]); if (i < n-1) buf.append(","); }
         * log(buf.toString()); }
         */
    }    
    
    private void doAfterProcessing(ServletRequest request, ServletResponse response)
            throws IOException, ServletException {
        if (debug) {
      //      log("PDFilter:DoAfterProcessing");
        }

        // Write code here to process the request and/or response after
        // the rest of the filter chain is invoked.

        // For example, a logging filter might log the attributes on the
        // request object after the request has been processed. 
	/*
         * for (Enumeration en = request.getAttributeNames();
         * en.hasMoreElements(); ) { String name = (String)en.nextElement();
         * Object value = request.getAttribute(name); log("attribute: " + name +
         * "=" + value.toString());
         *
         * }
         */

        // For example, a filter might append something to the response.
	/*
         * PrintWriter respOut = new PrintWriter(response.getWriter());
         * respOut.println("<P><B>This has been appended by an intrusive
         * filter.</B>");
         */
    }

    /**
     *
     * @param request The servlet request we are processing
     * @param response The servlet response we are creating
     * @param chain The filter chain we are processing
     *
     * @exception IOException if an input/output error occurs
     * @exception ServletException if a servlet error occurs
     */
    public void doFilter(ServletRequest request, ServletResponse response,
            FilterChain chain)
            throws IOException, ServletException {
        
  /**      if (debug) {
            log("PDFilter:doFilter()");
        }*/
        
        doBeforeProcessing(request, response);
       boolean authorized = false;

        if (request instanceof HttpServletRequest) {
        HttpSession session = ((HttpServletRequest)request).getSession(false);
            if (session != null) {
        User user = (User) session.getAttribute("buyer");
        String username=user.getUsername();
        String url=(String)((HttpServletRequest)request).getRequestURI();
   

if(url.contains(username)){ authorized=true;}


if (authorized) { chain.doFilter(request, response);
} else {

  ((HttpServletResponse) response).sendRedirect(((HttpServletRequest) request).getContextPath()+"/ErrorLoginServlet");
  
  
}
}
        
        
        
        doAfterProcessing(request, response);

    }}

    /**
     * Return the filter configuration object for this filter.
     */
    public FilterConfig getFilterConfig() {
        return (this.config);
    }

    /**
     * Set the filter configuration object for this filter.
     *
     * @param filterConfig The filter configuration object
     */
    public void setFilterConfig(FilterConfig config) {
        this.config = config;
    }

    /**
     * Destroy method for this filter
     */
    public void destroy() {        
    }

    /**
     * Init method for this filter
     */
    public void init(FilterConfig config) {        
        this.config = config;
        if (config != null) {
            if (debug) {                
         //       log("PDFilter:Initializing filter");
            }
        }
    }
}
    /**
     * Return a String representation of this object.
     
    @Override
    public String toString() {
        if (config == null) {
            return ("PDFilter()");
        }
        StringBuffer sb = new StringBuffer("PDFilter(");
        sb.append(config);
        sb.append(")");
        return (sb.toString());
    }
    
    private void sendProcessingError(Throwable t, ServletResponse response) {
        String stackTrace = getStackTrace(t);        
        
        if (stackTrace != null && !stackTrace.equals("")) {
            try {
                response.setContentType("text/html");
                PrintStream ps = new PrintStream(response.getOutputStream());
                PrintWriter pw = new PrintWriter(ps);                
                pw.print("<html>\n<head>\n<title>Error</title>\n</head>\n<body>\n"); //NOI18N

                // PENDING! Localize this for next official release
                pw.print("<h1>The resource did not process correctly</h1>\n<pre>\n");                
                pw.print(stackTrace);                
                pw.print("</pre></body>\n</html>"); //NOI18N
                pw.close();
                ps.close();
                response.getOutputStream().close();
            } catch (Exception ex) {
            }
        } else {
            try {
                PrintStream ps = new PrintStream(response.getOutputStream());
                t.printStackTrace(ps);
                ps.close();
                response.getOutputStream().close();
            } catch (Exception ex) {
            }
        }
    }
    
    public static String getStackTrace(Throwable t) {
        String stackTrace = null;
        try {
            StringWriter sw = new StringWriter();
            PrintWriter pw = new PrintWriter(sw);
            t.printStackTrace(pw);
            pw.close();
            sw.close();
            stackTrace = sw.getBuffer().toString();
        } catch (Exception ex) {
        }
        return stackTrace;
    }
    
    public void log(String msg) {
        config.getServletContext().log(msg);        
    }
}
*/